Systems and methods for selectively activating functions provided by a mobile phone

ABSTRACT

Methods for selectively activating one of multiple functions provided by a mobile phone are provided. An embodiment of a method for selectively activating one of multiple functions comprises the following steps. That the mobile phone has been coupled to a computer system is detected. A first interface is displayed to facilitate selection of a first function from the functions. That the first function is selected is detected by the first interface. At least one software module is configured to activate the first function, thereby the computer system is directed to employ the mobile phone as a first external electronic device corresponding to the first function.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional of U.S. Patent Application entitled“SYSTEMS AND METHODS FOR SELECTIVELY ACTIVATING FUNCTIONS PROVIDED BY AMOBILE PHONE,” Ser. No. 11/457,013, filed on Jul. 12, 2006, the entiretyof which are incorporated by reference herein.

BACKGROUND

The invention relates to mobile phones, and more particularly, tosystems and methods for selectively activating functions provided by aportable device.

Mobile phones are typically equipped with mass storage devices such asflash memory, digital cameras, transmission devices and others, toprovide various functions. These embedded devices may be accessed by anelectronic device such as a computer, a personal digital assistant(PDA), a programmable consumer electronic device or similar.

SUMMARY

Methods for selectively activating one of multiple functions provided bya portable device are provided. An embodiment of a method forselectively activating one of the multiple functions comprises thefollowing steps. The coupling of the portable device to a computersystem is detected. A first interface is displayed to facilitateselection of a first function. The selection of the first function viathe first interface is detected. At least one software module isconfigured to activate the first function, thereby directing thecomputer system to employ the portable device as a first externalelectronic device corresponding to the first function.

Apparatuses for selectively activating one of multiple functions areprovided. An embodiment of an apparatus for selectively activating oneof multiple functions comprises a connection device, a display and aprocessing unit. The processing unit coupling to the display and theconnection device detects that the apparatus has been coupled to acomputer system via the connection device, displays a first interface onthe display to facilitate selection of a first function from thefunctions, detects that the first function is selected via the firstinterface, and configures at least one software module executed thereinto activate the first function, thereby directing the computer system toemploy the apparatus as a first external electronic device correspondingto the first function.

Systems for selectively activating one of multiple universal serial bus(USB) functions are provided. An embodiment of a system for selectivelyactivating one of multiple USB functions comprises a USB controller, aUSB connector, a USB data line and a regulator. The USB data lineconnects the USB controller to the USB connector. The regulator disposedbetween a power source and the USB data line receives an enabling signalfrom the processing unit, and selectively converts the power source to apredetermined voltage level according to the enabling signal. Aconnection signal indicating that a USB device has been plugged in istransmitted when converting the power source to the predeterminedvoltage level, and a disconnection signal indicating that the USB devicehas been removed is transmitted when not converting the power source tothe predetermined voltage level.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention can be more fully understood by reading thesubsequent detailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a diagram of an embodiment of a computer system;

FIG. 2 a is a diagram of an embodiment of a mobile phone connecting to acomputer host;

FIG. 2 b is a diagram of an embodiment of a mobile phone coupling to acomputer host;

FIG. 3 is a diagram of an embodiment of a mobile phone installed in abase, which provides Web camera (webcam) functions;

FIGS. 4 a and 4 b are flowcharts illustrating an embodiment of a methodfor selectively activating functions provided by a mobile phone;

FIG. 5 is a diagram of an exemplary man-machine interface (MMI) of amenu;

FIG. 6 a is a diagram of the data structure of an exemplary devicedescriptor;

FIG. 6 b is a diagram of the data structure of an exemplaryconfiguration descriptor;

FIG. 6 c is a diagram of the data structure of an exemplaryother_speed_configuration descriptor;

FIG. 6 d is a diagram of the data structure of an exemplary interfacedescriptor;

FIG. 6 e is a diagram of the data structure of an exemplary endpointdescriptor;

FIG. 7 is a diagram of an exemplary MMI of a dialog box

FIGS. 8 to 13 are diagrams of embodiments of a universal serial bus(USB) system;

FIG. 14 is a diagram of the system architecture of an embodiment of amobile phone.

DETAILED DESCRIPTION

FIG. 1 is a diagram of an embodiment of a computer system 100 comprisinga display 110 and a computer host 130. The computer host 130 istypically equipped with at least one connection port such as 131 and 133or at least one wireless transceiver 135 capable of coupling to a mobilephone. The connection port may be a serial port or a parallel port. Aserial port, such as a RS232, RS242, Serial ATA (SATA), Universal SerialBus (USB), IEEE 1394 or Universal Asynchronous Receiver Transmitter(UART) port or similar, is an interface on a computer system by whichinformation is transferred in or out one bit at a time. A parallel port,such as an Integrated Drive Electronics (IDE), Small Computer SystemInterface (SCSI), IEEE 1284 port or similar, is an interface on acomputer system which enables data to be transferred in or out inparallel, that is, on more than one wire. A parallel port carries onebit on each wire thus multiplying the transfer rate obtainable over asingle cable (contrast serial port). There are usually several extrawires on the parallel port that are used for control signals to indicatewhen data is ready to be sent or received. A wireless transceiver, suchas an 802.x, Bluetooth or Infrared Data Association (IrDA) transceiveror similar, is an interface on a computer system by which information istransferred by radio frequency or infrared signals or similar. Moreover,those skilled in the art will understand that some embodiments of thecomputer 100 may be practiced with other computer system configurations,including handheld devices, multiprocessor-based, microprocessor-basedor programmable consumer electronics, notebooks and the like.

FIG. 2 a is a diagram of an embodiment of the mobile phone 200connecting to the computer host 130 via a connector 250, a connectionwire 251 and the connection port 131. FIG. 2 b is a diagram of anembodiment of the mobile phone 200 coupling to the computer host 130 byassociating with the wireless transceiver 135. When the mobile phone 200couples to the computer host 130 via the connection port 131 or thewireless transceiver 135, the computer host 130 may identify andconfigure the mobile phone 200 as an external mass storage device, avirtual comport device, a mobile TV receiver or the combination of atleast two of the above, by employing the universal plug and play (UPnP)protocol set forth by the UPnP forum. For example, the mobile phone 200may be configured as a combined device of a virtual comport device plusa mass storage device. When the mobile phone 200 operates as a virtualcomport device, software applications resident on the computer host 130communicate with the mobile phone 200 therebetween through theconventional RS-232 interface. At the same time, the mobile phone 200operates as a mass storage device, and the computer host 130 canread/write data from/to a non-volatile storage device of the mobilephone 200. Therefore, the computer host 130 can perform variousfunctions provided by the mobile phone 200, such as reading/writing datafrom/to a non-volatile storage device of the mobile phone 200 (massstorage function), receiving digital TV data via the mobile phone 200,connecting to an internet via the mobile phone 200 (comport function)and others. The mobile phone 200 may be equipped with a TV tuner (notshown), a video decoder (not shown), an audio processor (not shown) anda teletext processor (not shown) to receive digital TV data. The mobilephone 200 may lock on to a frequency by the TV tuner (not shown), andacquire video, audio and teletext data carried by the locked frequencyvia the video decoder (not shown), the audio processor (not shown) andthe telextext processor (not shown). In addition, the mobile phone 200may be equipped with a Bluetooth transceiver (not shown). An electronicdevice (not shown) equipped with a Bluetooth transceiver may exchangedata between the computer host 130 and itself via the mobile phone 200.

Moreover, FIG. 3 is a diagram of an embodiment of the mobile phone 200installed in a base 300, which provides a Web camera (webcam) function.The mobile phone may be equipped with an image sensor module (not shown)and an image signal processor (ISP, not shown). The image sensor module(not shown) may comprise multiple charge couple device (CCD) imagesensors, complementary metal oxide semiconductor (CMOS) image sensors orsimilar to record the intensity of light as variable charges. In orderto convert the content of the image sensor module (not shown) to adigital format, the ISP (not shown) may quantify the variable chargeinto a discrete number of colors. A bitmap image contains numerous pixeldata quantified by the ISP (not shown) in a given resolution such as640×480, 1024×768 and so on. The bitmap image may be further convertedinto a compressed format by an image encoder such as a JointPhotographic Experts Group (JPEG) encoder (not shown), GraphicsInterchange Format (GIF) encoder (not shown) or similar to generate acompressed image such as a JPEG, GIF image or similar. The bitmap imagesmay be encoded by a Moving Pictures Experts Group-4 (MP4) encoder (notshown) or similar to generate a series of encoded frames such as I-, P-and B-frames. The generated display objects such as bitmap, JPEG, GIFimages, I-, P-, B-frames or others, are continuously and seriallytransmitted to the computer host 130. The base 300 is provided tosupport the mobile phone 200 and enable easy placement in a relevantplace to facilitate focusing on and capturing images of a user by themobile phone 200. The base 300 and computer host 130 may provide variousconnection ports such as the described serial ports or parallel ports,for connection therebetween via wires 350. Webcam software executed bythe computer host 130 may provide two windows W310 and W330 for liveimage display, the window W330 displaying images showing a remote user,and the window W310 displaying images showing a user captured by themobile phone 200. The windows W310 and W330 may be handled by apeer-to-peer (P2P) communication application such as Microsoft MSNMessenger, Yahoo! Messenger, Skype or similar to interact with acorresponding P2P communication application resident on a remotecomputer host.

FIGS. 4 a and 4 b are flowcharts illustrating an embodiment of a methodfor selectively activating functions provided by a mobile phone, dividedinto two sections, a left section showing steps performed by a computerhost (e.g. 130 of FIG. 3 a or 3 b), and a right section showing stepsperformed by a mobile phone (e.g. 200 of FIG. 3 a or 3 b), separated bydashed lines for added clarity. That the mobile phone has been coupledto the computer host is detected (step S510 of FIG. 4 a). For example,that the mobile phone has been connected to the computer host isdetected by detecting high voltage at pin V_(Bus) of a USB connector(i.e. a USB link). An MMI (Man-Machine Interface) facilitating userdetermination of one function or combination of at least two functionsfrom multiple predefined functions to be activated is displayed on adisplay of the mobile phone (step S520 of FIG. 4 a). FIG. 5 is a diagramof an exemplary MMI of a menu 500 containing four menu items 510 to 570and two soft keys 580 and 590. The menu items 510 to 570 respectivelydisplay text prompts “Webcam”, “Mass storage”, “Virtual comport” and“Bluetooth” It is determined which function or functions are to beselectively activated via the displayed menu (step S530 of FIG. 4 a).

For example, when “Webcam” and “Mass storage” functions are selectivelyactivated via the displayed menu, the mobile phone 200 may be configuredas a combined device of a Webcam plus a mass storage device. Therefore,the computer host 130 can read/write data from/to a non-volatile storagedevice of the mobile phone 200, operating the mobile phone 200 as anexternal mass storage device, and receive the images captured by thecamera module of the mobile phone 200, operating the mobile phone 200 asa Webcam.

Referring to FIG. 4 a, connection signal and device function descriptionare transmitted from the mobile phone (step S540 of FIG. 4 a), and arereceived by the computer host (step S410 of FIG. 4 a). The connectionsignal is utilized to notify the computer host that an electronic device(i.e. the mobile phone) has been connected. The device functiondescription may contain profile information indicating a vendoridentity, product identity, device description, interface identity, orsimilar for configuring the mobile phone. Moreover, the device functiondescription contains driver identity or identities corresponding to thedetermined function or functions (as shown in step S530 of FIG. 4 a).The driver or drivers corresponding to the received driver identity oridentities and resident on the computer host are activated according tothe content of the received device function description (step S420 ofFIG. 4 a). It is to be understood that the activated driver may be apublic driver provided by a software vendor of an OS such as Window2000™, Windows XP™, Linux, or similar, or may be a native driverprovided by a manufacturer of the mobile phone. The public driver isautomatically installed when the OS is installed in the computer host.When installing the native driver in the computer host, additionaldownload/load effort for the native driver from a Web site on theInternet, an optical disc, a portable drive or similar, may be required.

After transmitting the device function description (step S540 of FIG. 4a), at least one software module such as a command processing engine, afile system driver, an image signal processor (ISP) driver, or similar,resident on the mobile is configured for the determined function orfunctions (step S550 of FIG. 4 a). After successfully executing stepsS550 and S420, the computer host may employ the coupled mobile phone asan external mass storage, a virtual comport, a Webcam or anotherexternal electronic device. Details of data communication between thecomputer host and the coupled mobile phone are well-known in the art andbriefly described herein. Moreover, a dialog box is displayed on adisplay of the mobile phone (S560 of FIG. 4 a), facilitatingdisconnection from the computer host or reactivation of another functionor functions by a user. FIG. 7 is a diagram of an exemplary MMI of adialog box 700 containing a prompt message 710 and two soft keys 720 and730. The prompt message 710 indicates that the mobile phone is couplingto a computer host. It is determined whether a user desires todisconnect the current connection or reselect a function or functions.For example, it is determined that a user desires to disconnect thecurrent connection when a hard key corresponding to the soft key 720 ispressed, otherwise, a user desires to reselect a function or functionswhen a hard key corresponding to the soft key 730 is pressed.

A key press event associated with one hard key corresponding to the softkey 720 or 730 is detected (S910 of FIG. 4 b). It is determined whethera disconnection or reselection operation is instructed to be processed(S920 of FIG. 4 b). When a disconnection operation is instructed, themobile phone proceeds to configure at least one software module residenton mobile phone for stopping the activated function (S930 of FIG. 4 b),opposite to the previously executed step S550 of FIG. 4 a whichconfigures the at least one software module for activating the function,and transmit a disconnection signal to the computer host (S935 of FIG. 4b). When a reselection operation is instructed, the mobile phoneproceeds to configure at least one software module resident on mobilephone for stopping the activated function (S938 of FIG. 4 b), oppositeto the previously executed step S550 of FIG. 4 a which configures the atleast one software module for activating the function, and transmit adisconnection signal to the computer host (S940 of FIG. 4 b). Thedisconnection signal is utilized to notify the computer host that acoupled electronic device (i.e. the mobile phone) has been uncoupled.After receiving the disconnection signal (S810 of FIG. 4 b), thecomputer host deactivates the activated driver (S820 of FIG. 4 b). Aftertransmitting the disconnection signal, the mobile phone proceeds toperform steps S950 to S980 of FIG. 4 b for the reselection operation.Details of steps S950 to S980 are similar to steps S520 to S550, and arebriefly described herein. Also, details of steps S830 and S840 of FIG. 4b are similar to steps S410 and S420 of FIG. 4 a, and are brieflydescribed herein.

Referring to steps S540 and S410 of FIG. 4 a, and steps S960 and S840 ofFIG. 4 b, the device function description is preferably carried bymultiple descriptors such as “device”, “configuration”,“other_speed_configuration”, “interface” and “endpoint” descriptors setforth by universal serial bus specification revision 2.0 on Apr. 27,2000. The device descriptor may describe general information about thecoupled mobile phone (e.g. 200 of FIG. 3 a or 3 b). FIG. 6 a is adiagram of the data structure of an exemplary device descriptorcontaining fourteen fields. For an example, when activating thedescribed mass storage function (S530 of FIG. 4), three fields“bDeviceClass” F6101, “bDeviceSubClass” F6102 and “bDeviceProtocol”F6103 are set to a preserved value “0x00.” For another example, whenactivating the described virtual comport function (S530 of FIG. 4), thedescribed fields F6101 to F6103 are respectively set to preserved values“0x02”, “0x00” and “0x00.” The configuration descriptor describesinformation about configurations for the coupled mobile phone. FIG. 6 bis a diagram of the data structure of an exemplary configurationdescriptor containing eight fields. The mobile phone may provide morethan one configuration descriptor to the computer host, and eachconfiguration descriptor may describe a number of interfaces. Theother_speed_configuration descriptor describes a configuration of a highspeed capable device, being identical to a configuration descriptor.FIG. 6 c is a diagram of the data structure of an exemplaryother_speed_configuration descriptor containing eight fields. Theinterface descriptor describes a specific interface within aconfiguration. FIG. 6 d is a diagram of the data structure of anexemplary interface descriptor containing nine fields. In one example,when activating the described mass storage function (S530 of FIG. 4),three fields “bInterfaceClass” F6201, “bInterfaceSubClass” F6202 and“bInterfaceProtocol” F6203 are respectively set to preserved values“0x08”, “0x06” and “0x50.” The interface and device descriptor describedabove indicates that the coupled mobile phone supports the standard massstorage interface. In another example, when activating the describedvirtual comport function (S530 of FIG. 4), two interface descriptors arenecessary provided. In one interface descriptor, the described fieldsF6201 to F6203 are respectively set to preserved values “0x02”, “0x02”and “0x00”, moreover, in the other interface descriptor, the describedfields F6201 to F6203 are respectively set to preserved values “0x0a”,“0x00” and “0x00.” The interface and device descriptor described aboveindicates that the coupled mobile phone supports these two standardvirtual comport interface. Each interface descriptor may associate withzero or more endpoint descriptors. The endpoint descriptor containsinformation required by the computer host to determine the bandwidthrequirements of each endpoint. FIG. 6 e is a diagram of the datastructure of an exemplary endpoint descriptor containing six fields.

When the mobile phone connects to the computer host via the USB link,the mobile phone further contains a connection control device togenerate the described connection and disconnection signals as shown insteps S540 and S410 of FIG. 4 a, and steps S970 and S830 of FIG. 4 b.FIG. 8 is a diagram of a first embodiment of a USB system 800 comprisinga USB controller 810, an external USB connector 830 (referring to 250 ofFIG. 2 a) and a regulator 850. In some embodiments, the regulator 850may be a power unit embodied in a power management integrated circuit(PMIC). The USB data lines D+ and D− are connected between the USBcontroller 810 and the external USB connector 830 through resistors R81and R82 for matching of the characteristic impedance of 90Ω±15%. Thoseskilled in the art will realize that the matching resistors R1 and R2are disposed closer the USB controller 810 than the external USBconnector 830. The data line D+ may be pulled high to V_(USB) (3.3V)through a resistor R83, preferably 1.5KΩ. The regulator 850 is disposedbetween power source VPP and the resistor R83, selectively convertingthe VPP into the V_(USB) or not according to an enabling signal USB_EN.When the enabling signal USB_EN is set to high (i.e. enabling USBdevice), the regulator 850 converts the VPP into the V_(USB), therebythe computer host (e.g. 130 of FIG. 2 a) to recognize that a full-speedUSB device (e.g. 200 of FIG. 2 a) has been plugged in. Otherwise, whenthe enabling signal USB_EN is set to low (i.e. disabling USB device),the regulator 850 does not convert the VPP to V_(USB), thereby thecomputer host (e.g. 130 of FIG. 2 a) recognizes that a connectedfull-speed USB device (e.g. 200 of FIG. 2 a) has been removed. Referringto steps S540 of FIG. 4 a and S970 of FIG. 4 b, the connection signalmay be generated by setting the enabling signal USB_EN to high.Referring to steps S940 of FIG. 4 b, the disconnection signal may begenerated by setting the enabling signal USB_EN to low. It is to beunderstood that the disconnect signal is generated by setting theenabling signal.

It is understood by the skilled in the art, when the mobile phone isconnected to the computer host by plugging in the USB device, theconnection signal is sent to the computer host and some software modulesare configured to be activated, and when the mobile phone isdisconnected from the computer host by plugging out the USB device, thedisconnection signal is sent to the computer host and some softwaremodules are configured to be stopped. In the S920 of FIG. 4, when theuser directly plugs out the USB device of the mobile phone from thecomputer host or when the user presses the hard key corresponding to thesoft key “Disconnect” 720 of FIG. 7 without the plugging-out, thedisconnection operation is determined, and the disconnection signal issent to the computer host so as to stop some software modules, disablingthe predetermined function. In the S920 of FIG. 4, when the userdirectly plugs out and then re-plugs in the USB device of the mobilephone or when the user presses the hard key corresponding to the softkey “Reselect” 730 of FIG. 7 without the plugging-out and re-pluggingin, the reselection operation is determined, and the disconnectionsignal is sent to the computer host so as to stop some software modules,disabling the predetermined function, and then the connection signal issent to the computer host so as to activate some other software modules,enabling another predetermined function.

FIG. 9 is a diagram of a second embodiment of the USB system 800. Thedifferences from the first embodiment are described in the following.The data line D− may be pulled high to V_(USB) (3.3V) through a resistorR83, preferably 1.5KΩ. When the enabling signal USB_EN is set to high(i.e. enabling USB device), the regulator 850 converts the VPP to theV_(USB), thereby the computer host (e.g. 130 of FIG. 2 a) recognizesthat a low-speed USB device (e.g. 200 of FIG. 2 a) has been plugged in.Otherwise, when the enabling signal USB_EN is set to low (i.e. disablingUSB device), the regulator 850 does not convert the VPP to the V_(USB),thereby the computer host (e.g. 130 of FIG. 2 a) recognizes that aconnected low-speed USB device (e.g. 200 of FIG. 2 a) has been removed.

FIG. 10 is a diagram of a third embodiment of the USB system 800 furthercontaining a switching device 870. The differences from the firstembodiment are described in the following. The switching device 870,preferably a multiplexer or an analog switch, is disposed between theUSB controller 810 and the USB external connector 830, and selectivelyconnects and disconnects the data line D+ according to an enablingsignal USB_EN. When the enabling signal USB_EN is set to high (i.e.enabling USB device), the switching device 870 connects the data lineD+, thereby the computer host (e.g. 130 of FIG. 2 a) to recognize that afull-speed USB device (e.g. 200 of FIG. 2 a) has been plugged in. Whenthe enabling signal USB_EN is set to low (i.e. enabling USB device), theswitching device 870 disconnects, thereby the computer host (e.g. 130 ofFIG. 2 a) to recognize that a connected full-speed USB device (e.g. 200of FIG. 2 a) has been removed. FIG. 11 is a diagram of a fourthembodiment of the USB system 800. In the fourth embodiment, theswitching device 870 and the resistor R83 are combined into thecontroller side.

FIG. 12 is a diagram of a fifth embodiment of the USB system 800. Thedifferences from the third embodiment are described in the following.The switching device 870 is disposed between the USB controller 810 andthe USB external connector 830, and selectively connects and disconnectsthe data line D− according to an enabling signal USB_EN. When theenabling signal USB_EN is set to high (i.e. enabling USB device), theswitching device 870 connects the data line D−, thereby the computerhost (e.g. 130 of FIG. 2 a) recognizes that a low-speed USB device (e.g.200 of FIG. 2 a) has been plugged in. When the enabling signal USB_EN isset to low (i.e. enabling USB device), the switching device 870disconnects the data line D−, thereby the computer host (e.g. 130 ofFIG. 2 a) recognizes that a connected low-speed USB device (e.g. 200 ofFIG. 2 a) has been removed. FIG. 13 is a diagram of a sixth embodimentof the USB system 800. In the sixth embodiment, the switching device 870and the resistor R83 are combined into the controller side.

FIG. 14 is a diagram of the system architecture of an embodiment of amobile phone (e.g. 200 of FIG. 2 a or 2 b) comprising a radio frequency(RF) transceiver 15200 connecting to an antenna 15100, a processing unit15300, a connection system 15400, a display 15500 and a keypadcontroller 15600 connecting to a keypad 15610. The processing unit 15300connects to the radio frequency (RF) transceiver 15200, connectionsystem 15400, display 15500 and keypad controller 15600 via buses andperforms methods for selectively activating one of multiple functionsprovided by the mobile phone (e.g. FIGS. 4 a and 4 b). Referring to stepS510 of FIG. 4 a, that the mobile phone has been connected to a computerhost may be detected via the connection system 15400. The connectionsystem 15400 may be implemented in the described USB system 800 (FIG. 8,9, 10, 11, 12 or 13). Referring to steps S520, S560 and S950 of FIGS. 4a and 4 b, the menu and dialog box may be displayed on the display15500. Referring to steps S530, S910 and S950 of FIGS. 4 a and 4 b, thekey press event may be detected via the keypad controller 15600.Referring to steps S540, S940 and S970 of FIGS. 4 a and 4 b, theconnection and disconnection signals and the device function descriptionmay be transmitted via the connection system 15400. Referring to stepsS550 and S980 of FIGS. 4 a and 4 b, the configured module may beexecuted in the processing unit 15300.

Methods for selectively activating functions provided by a mobile phone,or certain aspects or portions thereof, may take the form of programcodes (i.e., instructions) embodied in tangible media, such as floppydiskettes, CD-ROMS, hard drives, or any other machine-readable storagemedium, wherein, when the program codes are loaded into and executed bya machine, such as a computer, a DVD recorder or similar, the machinebecomes an apparatus for practicing the invention. The disclosed methodsmay also be embodied in the form of program codes transmitted over sometransmission medium, such as electrical wiring or cabling, through fiberoptics, or via any other form of transmission, wherein, when the programcodes are received and loaded into and executed by a machine, such as acomputer, the machine becomes an apparatus for practicing the invention.When implemented on a general-purpose processor, the program codescombine with the processor to provide a unique apparatus that operateanalogously to specific logic circuits.

Certain terms are used throughout the description and claims to refer toparticular system components. As one skilled in the art will appreciate,consumer electronic equipment manufacturers may refer to a component bydifferent names. This document does not intend to distinguish betweencomponents that differ in name but not function.

Although the invention has been described in terms of preferredembodiment, it is not limited thereto. Those skilled in the art can makevarious alterations and modifications without departing from the scopeand spirit of the invention. Therefore, the scope of the invention shallbe defined and protected by the following claims and their equivalents.

1. A system for selectively activating one of plurality universal serialbus (USB) functions, comprising: a USB controller; a USB connector; aUSB data line connected between the USB controller to the USB connector;and a regulator disposed between a power source and the USB data line,receiving an enabling signal from the processing unit, and selectivelyconverting the power source to a predetermined voltage level accordingto the enabling signal, wherein the enabling signal is generated by theprocessing unit when one of the USB functions is activated; a connectionsignal indicating that a USB device has been plugged in is transmittedwhen converting the power source to the predetermined voltage level, anda disconnection signal indicating that the USB device has been removedis transmitted when not converting the power source to the predeterminedvoltage level.
 2. The system as claimed in claim 1 further comprising: aswitching device disposed between the USB controller and the USBconnector, and selectively connecting and disconnecting the data lineaccording to the enabling signal, the connection signal is transmittedwhen connecting the data line, and the disconnection signal istransmitted when disconnecting the data line.
 3. The system as claimedin claim 2 wherein the switching device is a multiplexer or an analogswitch.
 4. The system as claimed in claim 1 wherein the regulator is apower unit embodied in a power management integrated circuit (PMIC). 5.The system as claimed in claim 1 wherein the disconnection signal isgenerated and transmitted by pulling low the USB data line, and theconnection signal is generated and transmitted by pulling high the USBdata line.